It sure is mostly comedy, a real change of pace compared to XY(&Z) Minus the pokémon names jokes, it's usually nice comedy.
Where Sun & Moon shines the most, it's through it's characters. The cast is vibrant, full of personality.
The show really shines when it tries to be serious; there's a whole episode dealing with death (which is something almost never talked in Pokémon) another one about family issues; and more recently, the episodes focusing on Lilly's trauma.
As of episode 50, lots of things actually happened, and it was by far the most shocking episode of the series, due to the way it ended.
